Issue 91

Review: Dynacord PM502 Powered Mixer

The humble Besser block of yore may be long gone, but the powered mixer still has plenty of appeal.


18 December 2014

Review: Christopher Holder

My, how the humble powered ‘brick’ has grown up! Prior to lightweight Class D amplification coming of age, the portable powered mixer adhered to a very familiar form factor: 19-inch wide, normally about 4U high, a humble array of basic EQ, knobbage and metering, and heavy enough to suck passing comets into its orbit.

These unglamorous workhorses would be in every PA rental inventory (let’s not forget that powered PA boxes were until this millennia something only Meyer Sound really considered worth the hassle and Meyer never did anything portable), and in most pubs and clubs. When not in use they would prop doors open, and keep corrugated iron roofs from blowing away in the cyclone season.

Powered PAs have eroded the ‘brick’s’ market, making way for more highly featured small format (‘unpowered’) consoles with better EQ, more auxes, and even some basic effects. The brick has had its day. Or has it?

Dynacord has identified a market for a small-format powered mixer that is largely unmet by the current crop of products. The new PM502 is that product and it’s really rather good.


When I first pulled the PM502 out of its box I involuntarily threw the unit up over my head like an Armenian weightlifter. I couldn’t believe how light (4.9kg) and compact it was.

The layout is easy and uncluttered — you don’t need fingers like knitting needles to operate the channel EQ. Plug in a mic and turn up the gain, you’re underway. There are three stereo inputs (including two pairs of RCA), which is more than customary on a compact mixer but is right for the market (think: iPods, DJs, the AM/FM receiver). What’s more you can plug in a USB stick and the PM502 will read and play back music via the LCD.

For the purposes of this review I plugged the Speakon connectors into a couple of passive Bose foldback monitors. Talking into an AKG D880 dynamic mic there was plenty of clean level — whisper quiet even when cranking the 65dB of gain (there’s a global phantom power switch for condenser mics). The amp is rated at 2 x 450W (max. @ 1kHz) into 4Ω, which is perfectly adequate for a 12+horn box in most general purpose applications. No one is contending the PM502’s amplification will set the dancefloor alight or shake the chandeliers, but there’s more than enough welly for any portable application.

I then connected the Master B outputs into a pair of 15+horn active FBT loudspeakers. It was a neat combination. There’s some routing flexibility that means I could send the Aux foldback output to the Speakons rather than the default Master A output. It demonstrated to me how the PM502 can happily jump into any passive/active loudspeaker combo.

After plugging my iPod into a pair of RCA sockets I was able to test some of the bingo call/DJ/aerobic instructor features. The PM502 features a very capable ducker called Talk Over. There are four presets that provide various levels of music attenuation and shape of the ducker’s ADSR envelope.

The compressor is also quite well spec’ed and easy to use. I guess you’d call it ‘master bus’ compression — you can’t switch it in on a per-channel basis. You can select from a handful of presets, everything from brickwall limiting to the more gentle Uplift Soft setting, and then, if you so desire, dig in and make changes to the threshold, attack, release, and ratio via the LCD.

Rounding out the master section features is an effects engine. As you’d expect, every channel (mono and stereo) has a post-fade FX pot, while the master section has FX send and FX return master pots. There’s a handy smorgasbord of reverbs, delays and modulation effects to choose from. What’s more, you can use the footswitch input to turn the effect on/off (handy for mix-it-yourself musicians).





    Bosch: (02) 9683 4752 or

  • PROS

    • Three independent outputs
    • Routing flexibility with the amp channels
    • 100V line ‘Direct Drive’ mode

  • CONS

    • No per-channel on/off button
    • Limited metering


    The best compact powered mixer on the market? Thanks to the PM502’s DSP, routing flexibility, Direct Drive 100V line mode and portability… the answer is yes.


The PM502’s LCD takes care of all housekeeping duties. It’s a familiar ‘one pushbutton pot’ affair. Anyone who’s used an iPod won’t have any trouble getting around the UI.

There are plenty of rewards for those who take the time to jump in. For example, at first glance you might assume the seven-band graphic EQ is set to work across the main stereo output, but you’ll discover you can have a different, independent GEQ set up for all three.

You’ll also discover a somewhat arcane LPN page. The so-called low-pass notch filters are a proprietary Dynacord feature designed to squeeze some more low-end impact out of a smaller system. It’s a little like the ‘bass boost’ button on your old ghetto blaster, although it’s more dynamic than a simple EQ contour.


There’s plenty to like about the PM502 package. Combining a traditional rackmount mixer interface with a very serviceable array of digital processing, it will slot into plenty of installs which require more mixing features than a basic zone mixer.

I won’t pretend that it’s a FOH engineer’s mixing board of choice: the tone controls are broadbrush and the metering is quite rudimentary. Rather, the PM502 is built for ease of use on the front end.

Installers will get a real kick out of the the 100V Direct Drive mode, so you can plug in your constant voltage speakers via the Euroblock connectors on the back panel. This is a fantastic, out-of-the-box boon for venues with multi-speaker, distributed systems or where distance is a factor. Installers will also love the three-stage, four-digit, password-protected lockout mode.


The brick is dead, long live the brick… albeit a featherweight, DSP-turbo-charged ‘brick’ with some very 21st century features.

If your work doesn’t require you to mix so much as ‘set levels’, then the PM502 is a sophisticated and powerful solution with some professional install-friendly features.

My final observation and something that instils considerable confidence, is the fact that Dynacord didn’t contrive a way of expressing the Class D amp power as 2 x 500W (rather than 450W) thus pushing it over the combined magical ‘1000W’ marketing threshold. Thank you Dynacord. Thank you for being so scrupulously German. 


Master B control can be delayed: You can set the delay in feet, metres or milliseconds (up to 145.8ms) — which is great for setting up delay stacks in a pub or indeed just setting your main PA to align with guitar amps on stage or your subs.

Multiple levels of lockout: Essential for certain installs to stop prying hands from accidentally (or maliciously) tweaking system settings.

USB interface: take a 16-bit digital tap from the desk straight to your PC without any additional hardware.


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